Fix changelog for ssl_server2.c usage fix
diff --git a/ChangeLog b/ChangeLog
index ec91259..b3d4d51 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -8,6 +8,7 @@
 Bugfix
    * Fix memory leak in mbedtls_ssl_set_hostname() when called multiple times.
      Found by projectgus and jethrogb, #836.
+   * Fix usage help in ssl_server2 example. Found and fixed by Bei Lin.
 
 = mbed TLS 2.6.0 branch released 2017-08-10